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"SHOW BINLOG EVENTS" Problem: ======== mysql was crashed after executing "show binlog events in 'mysql-bin.000005' from 99", the crash happened randomly. Analysis: ======== During construction of LOAD EVENT or NEW LOAD EVENT object if the starting offset is provided as incorrect value then all the object members that are retrieved from the offset are also invalid. Some times it will lead to out of bound address offsets. In the bug scenario, the file name is extracrated from an invalid address and the same is fed to strlen(fname) function. Passing invalid address to strlen will lead to crash. Fix: === Validate if the given offset falls within the event boundary or not. sql/log_event.cc: Added code to validate fname's address. "fname" should be within event boundary. Added code to find invalid invents.
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